Merge remote-tracking branch 'asoc/topic/pcm512x' into asoc-next
[sfrench/cifs-2.6.git] / arch / arm64 / include / asm / kexec.h
1 /*
2  * kexec for arm64
3  *
4  * Copyright (C) Linaro.
5  * Copyright (C) Huawei Futurewei Technologies.
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License version 2 as
9  * published by the Free Software Foundation.
10  */
11
12 #ifndef _ARM64_KEXEC_H
13 #define _ARM64_KEXEC_H
14
15 /* Maximum physical address we can use pages from */
16
17 #define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
18
19 /* Maximum address we can reach in physical address mode */
20
21 #define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
22
23 /* Maximum address we can use for the control code buffer */
24
25 #define KEXEC_CONTROL_MEMORY_LIMIT (-1UL)
26
27 #define KEXEC_CONTROL_PAGE_SIZE 4096
28
29 #define KEXEC_ARCH KEXEC_ARCH_AARCH64
30
31 #ifndef __ASSEMBLY__
32
33 /**
34  * crash_setup_regs() - save registers for the panic kernel
35  *
36  * @newregs: registers are saved here
37  * @oldregs: registers to be saved (may be %NULL)
38  */
39
40 static inline void crash_setup_regs(struct pt_regs *newregs,
41                                     struct pt_regs *oldregs)
42 {
43         if (oldregs) {
44                 memcpy(newregs, oldregs, sizeof(*newregs));
45         } else {
46                 u64 tmp1, tmp2;
47
48                 __asm__ __volatile__ (
49                         "stp     x0,   x1, [%2, #16 *  0]\n"
50                         "stp     x2,   x3, [%2, #16 *  1]\n"
51                         "stp     x4,   x5, [%2, #16 *  2]\n"
52                         "stp     x6,   x7, [%2, #16 *  3]\n"
53                         "stp     x8,   x9, [%2, #16 *  4]\n"
54                         "stp    x10,  x11, [%2, #16 *  5]\n"
55                         "stp    x12,  x13, [%2, #16 *  6]\n"
56                         "stp    x14,  x15, [%2, #16 *  7]\n"
57                         "stp    x16,  x17, [%2, #16 *  8]\n"
58                         "stp    x18,  x19, [%2, #16 *  9]\n"
59                         "stp    x20,  x21, [%2, #16 * 10]\n"
60                         "stp    x22,  x23, [%2, #16 * 11]\n"
61                         "stp    x24,  x25, [%2, #16 * 12]\n"
62                         "stp    x26,  x27, [%2, #16 * 13]\n"
63                         "stp    x28,  x29, [%2, #16 * 14]\n"
64                         "mov     %0,  sp\n"
65                         "stp    x30,  %0,  [%2, #16 * 15]\n"
66
67                         "/* faked current PSTATE */\n"
68                         "mrs     %0, CurrentEL\n"
69                         "mrs     %1, SPSEL\n"
70                         "orr     %0, %0, %1\n"
71                         "mrs     %1, DAIF\n"
72                         "orr     %0, %0, %1\n"
73                         "mrs     %1, NZCV\n"
74                         "orr     %0, %0, %1\n"
75                         /* pc */
76                         "adr     %1, 1f\n"
77                 "1:\n"
78                         "stp     %1, %0,   [%2, #16 * 16]\n"
79                         : "=&r" (tmp1), "=&r" (tmp2)
80                         : "r" (newregs)
81                         : "memory"
82                 );
83         }
84 }
85
86 #if defined(CONFIG_KEXEC_CORE) && defined(CONFIG_HIBERNATION)
87 extern bool crash_is_nosave(unsigned long pfn);
88 extern void crash_prepare_suspend(void);
89 extern void crash_post_resume(void);
90 #else
91 static inline bool crash_is_nosave(unsigned long pfn) {return false; }
92 static inline void crash_prepare_suspend(void) {}
93 static inline void crash_post_resume(void) {}
94 #endif
95
96 #endif /* __ASSEMBLY__ */
97
98 #endif